### Home > A2C > Chapter 12 > Lesson 12.1.4 > Problem 12-64

12-64.

Write each series in sigma notation and find the sum or an expression for the sum.

What is the expression for the sequence?

How many terms are there in the series?

One possible answer:

Instead of going up to a specific term, this series sums up the first

*n*terms of the sequence given in parentheses.